With every major release of iOS and a new iPhone, Apple typically offers its official user guide online for free. What’s odd is that Apple doesn’t promote this resource at all, yet it’s still available. Each iOS device purchase comes with a little booklet to help familiarize a new customer with the basics of the device and iOS itself, but the full user guide is much more thorough and extensive.
Apple has an official user guide out for the iPhone 5 and iOS 6. The 365 page guide is available for anyone to view on the web, and Apple has also made it available for free in the iBookstore.